“Some physical characteristics such as black hair are common among many, but not all, Native Americans. Others, including head and body shape, height, skin color, and facial hair, vary significantly. Native American men from Pacific Coast tribes, for example, often have heavy facial hair while other Native American men have none.” source

That said, I have many male friends who belong to different plains tribes and not one of them has facial or chest hair.

Well, there has to be some truth to it. I lived in Winnipeg for a long time, and there a lot of natives there. I’ve never, ever seen one with a beard. Sometimes they have little mustaches, and a bit of stubble. Even then. But I’ve never seen full stashes or beards. I have no idea why that is.